Brick arch for boiler-furnaces.



8, F. STREET Patented Sept. 14, 1915.

2 SHEETS SHEET I.

INVENTOR C. F. STREET.

BRICK ARCH FOR BOILER FURNACES.

APPLICATION FILED MAY 22. 1915.

1,153,648. Patented Sept. 14, 1915.

2 SHEETS-SHEET 2.

eg gg 6 f2 w I! L INVENTOH uni s PANT are,

. CLEMENT E. STREET, 01 NEW YoEK, my.

BRICK ARCH FOR BOILERPFURNAGE S.

To all whom it may concern:

Be it known that I, CLEMENT F. STREET,

' of which improvement the following is a specification.

This invention relates to boiler furnaces, and more particularly to locomotive boilers, the object being to provide an improved brick arch of the type having a series of openings therethrough for permitting a portion of the draft to be divided and pass through the arch to the boiler fiues, while the remainder passes up over the top rear 1 and out through the boiler flues.

According to my improvement, the open bricks, which may be interspersed in any desired relation with the closed bricks, are formed with an upwardly and rearwardly inclined top wall acting as a balfie or deflector against which the current of flame and gas impinges in passing up through the openlng whereby the cinders or particles of fine fuel carried in said current will strike said inclined wall and be thrown back into the fire on the grate and be thoroughly consumed.

Another feature comprises a bridge wall located at the upper rear edgeof the arch and of such height as to leave the desired area for draft beneath the crown sheet of the boiler, which area may be varied accordinghto the amount of opening through the arc In the accompanying drawings: Figure 1 is a central longitudinal vertical section of the rear portion of a locomotive boiler having a brick arch embodying my improvement; Fig. 2, .a transverse section of the same taken on the line 22 of Fig. 1; Fig.

3, a transverse section, one half being taken on the line 3-3, and the other halfron the line 3 3 of Fig. 1'; Fig. 4, a perspective view of one of the open bricks; and Fig. 5, a detail sectional view showing a slightly modified form of arch brick.

As shown in the drawing, the firebox, 5, of the boiler is provided with a number of rearwardly and upwardly inclined circulating tubes, 6, extending over the furnace grate, 7, from the front of the firebox to the rear water wall of the boiler. On these Specification of Letters Patent. Paigent gd Sept, 141, 11915, Application filed May 22, 1915.

Serial No. 29,873.

tubes are mounted the rows of fire bricks, 8, forming the arch and extending over about one half of the fire box above the grate. According to my improvement a portion of the arch bricks are each formed with an opening, 9, through the same from the under side of the arch to the space above the same, and the opening is provided with a bafiie, preferably in the form of a rearwardly inclined deflecting wall, 10, for throwing back the particles of fuel which strike against the same, and for directing the current of gases toward the rear of the fire box. The open bricks also have vertical side walls, 11, provided with grooves for supporting the same on the water tubes, as shown more clearly in Figs. 8 and 4; According to the interspersed arrangement shown in the drawings, each alternate brick of the intermediate longitudinal rows upon the circulation tubes is of the open type, the bricks in adjacent rows being staggered, but other arrangements may be employed, if preferred.

At the upper end of the arch is located the bridge wall, 12, also supported on the circulating tubes, and extending transversely" across the fire box, as shown in Fig. 2. The height of the bridge wall may be 'varied'to give the desired area of opening below the crown sheet of the boiler in proportion to number of open bricks employed and the draft area through the arch.

According to the preferred construction, the open bricks are formed in one integral piece comprising the two vertical side walls and the inclined top wall, as shown'in Fig. 4, but it is evident that they may be formed in two or more parts if desired, as indicated in Fig. 5 .'of the drawing.

With my improved construction, the portion of the draft passing through the arch is divided up into a number of small streams, each impinging against the inclined top wall of the open brick which deflects nearly all.

, ters Patent is:

1. In a boiler furnace, the combination with Water tubes extending longitudinally from the front of the fire box upwardly and rearwardly, of a brick arch comprising a series of longitudinal rows of bricks supported between adjacent water tubes, some of the bricksbeing formed of two vertical side walls and a rearwardly and upwardly inclined top .wall to provide openings through the arch, the vertical side walls resting upon the water tubes.

2. In a boiler furnace, the combination with water tubes extending longitudinally from the front of the fire box upwardly and rea-rwardly, of a brick arch comprising a series of longitudinal rows of bricks supported between adjacent water tubes, the alternate bricks of some of the rows being formed of a rearwardly and upwardly inclined top wall and two vertical side walls resting upon the water tubes.

3. In a boiler furnace, the combination with water tubes extending longitudinally from the front of the fire box upwardly and rearwardly, of a brick arch comprising a series of longitudinal rows of bricks sup ported between adjacent water tubes, some of the bricks being formed of a rearwardly and upwardly" inclined top wall and two vertical side walls resting upon the water tubes.

' 4. In a boiler furnace, the combination with water tubes extending longitudinally from the front of the fire box upwardly and rearwardly, of a brick arch comprising a series of longitudinal rows of bricks supported between adjacent water tubes, some of the bricks being open and some closed, the open bricks being formed of two vertical side walls and a rearwardly and upwardly inclined top wall and having an interspersed relation with the closed bricks.

5. In a boiler furnace, the combination with Water tubes extending longitudinally from the front of the fire box upwardly and rearwardly, of rows of bricks supported on said tubes, some of the bricks being formed of two vertical side walls and a rearwardly inclined top wall for providing openings through the arch, the vertical side walls of said bricks resting directly upon the water tubes.

In testimony whereof I have hereunto set 5 my hand.

CLEMENT F. STREET.- 

